net tech hnd 1

Communication

The act of transmitting and exchanging information between people, people and objects, and objects and objects through various media and actions.

Communication technology

Technology designed to help people communicate more efficiently and create better lives.

The Internet

The largest computer network in the world.

ARPAnet

The predecessor to the Internet, developed in 1969.

Network communication

Communication between terminal devices through a computer network.

Wave

Disturbances in energy that travel through a medium from one location to another.

Wavelength

The horizontal distance of a wave from a point to the corresponding point on the next wave.

Amplitude

The vertical distance from a given point on the wave to the horizontal axis.

Phase

The position of the waveform relative to time zero, measuring the delay of the wave.

Frequency

The number of waves made per second, measured in Hertz (Hz).

Period

The time required to complete one full cycle of a wave.

Analog wave

A wave in which both amplitude and time continuously vary, such as the human voice or music.

Signal

A sign or indication that conveys information or tells someone to do something.

Electrical signals

Voltages and currents in a circuit that convey information.

Acoustic signals

Audio or speech signals used for communication.

Digital wave

A wave with discrete states, such as high or low, used to store data as 0s and 1s.

Wired Media

Networking media that use cables to facilitate communication.

Wireless Media

Networking media that do not use cables and are not limited by physical geography.

Simplex Mode

A mode of connection where data flows in one direction only.

Half-duplex Mode

A mode of connection where data can flow in both directions, but not simultaneously.

Full-duplex Mode

A mode of connection where data flows simultaneously in both directions.

Serial transmission

Transmission where data is sent one bit at a time over a single wire.

Parallel transmission

Transmission where a group of bits is sent simultaneously over multiple channels.

Coaxial Cable

A cable with two conductors enclosed by an insulating protective coating.

Twisted Pair Cable

A wire composed of two insulated strands of copper wires twisted together.

Fiber Optic Cable

A cable made of thin glass fibers that conduct light for data transmission.

Radio Wave

A wireless medium used for multicast communications such as radio and TV broadcasting.

Line of Sight Propagation

Radio wave method where antennas must physically see each other to communicate.

Ground Wave Propagation

A method where radio waves are radiated directly towards the earth's surface.

SkyWave Propagation

A method where radio waves radiate into the ionosphere for long-distance communication.

Extremely Low Frequency (ELF)

Radio frequency between 30 Hz - 300 Hz used for AC power and telemetry signals.

Bluetooth

A short-range wireless technology for data transmission between devices.

Microwave

A wireless medium used for unicast communication including radar and satellite communication.